The whole reason we quit using our Kongs is because both dogs ismply lost interest. Try Nylabones - they last forever (and dogs love them), or rawhide strips (be sure to keep the water bowl full).
I just tossed the rawhide strips that were made in China. I'll have to get some new ones. Thanks for the tip.
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"I am the center of the universe!! I also like to chew on paper." my puppy